Without adding find the sum (a) 1 + 3 + 5 + 7 + ..... + 23 = ?(C) 1 – InterviewSolution

1.	Without adding find the sum (a) 1 + 3 + 5 + 7 + ..... + 23 = ?(C) 1 + 3 + 5 + 7 + ..... + 39 = ?
Answer» +(n-1)d=1+(n-1)2=232n-2=222n=24n=12S12=12/2×{2+22}=6×24=2242?an=1+(n-1)2=392n-2=382n=40n=20S20=20/2{2+38}=400

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